// SPDX-License-Identifier: Apache-2.0
/*
 *  FIPS-180-2 compliant SHA-384/512 implementation
 *
 * Copyright (c) 2019 Fuzhou Rockchip Electronics Co., Ltd
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */
/*
 *  The SHA-512 Secure Hash Standard was published by NIST in 2002.
 *
 *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
 */

#ifndef USE_HOSTCC
#include <common.h>
#include <linux/string.h>
#else
#include <string.h>
#endif /* USE_HOSTCC */
#include <u-boot/sha512.h>

#if defined(_MSC_VER) || defined(__WATCOMC__)
#define UL64(x) x##ui64
#else
#define UL64(x) x##ULL
#endif

/*
 * 64-bit integer manipulation macros (big endian)
 */
#ifndef GET_UINT64_BE
#define GET_UINT64_BE(n,b,i)                   \
{                                              \
    (n) = ((uint64_t)(b)[(i)    ] << 56)       \
        | ((uint64_t)(b)[(i) + 1] << 48)       \
        | ((uint64_t)(b)[(i) + 2] << 40)       \
        | ((uint64_t)(b)[(i) + 3] << 32)       \
        | ((uint64_t)(b)[(i) + 4] << 24)       \
        | ((uint64_t)(b)[(i) + 5] << 16)       \
        | ((uint64_t)(b)[(i) + 6] <<  8)       \
        | ((uint64_t)(b)[(i) + 7]      );      \
}
#endif /* GET_UINT64_BE */

#ifndef PUT_UINT64_BE
#define PUT_UINT64_BE(n,b,i)                          \
{                                                     \
    (b)[(i)    ] = (unsigned char) ((n) >> 56);       \
    (b)[(i) + 1] = (unsigned char) ((n) >> 48);       \
    (b)[(i) + 2] = (unsigned char) ((n) >> 40);       \
    (b)[(i) + 3] = (unsigned char) ((n) >> 32);       \
    (b)[(i) + 4] = (unsigned char) ((n) >> 24);       \
    (b)[(i) + 5] = (unsigned char) ((n) >> 16);       \
    (b)[(i) + 6] = (unsigned char) ((n) >>  8);       \
    (b)[(i) + 7] = (unsigned char) ((n)      );       \
}
#endif /* PUT_UINT64_BE */

/*
 * SHA-512 context setup
 */
static int __sha512_starts(sha512_context *ctx, int is384)
{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	if (is384 == 0) {
		/* SHA-512 */
		ctx->state[0] = UL64(0x6A09E667F3BCC908);
		ctx->state[1] = UL64(0xBB67AE8584CAA73B);
		ctx->state[2] = UL64(0x3C6EF372FE94F82B);
		ctx->state[3] = UL64(0xA54FF53A5F1D36F1);
		ctx->state[4] = UL64(0x510E527FADE682D1);
		ctx->state[5] = UL64(0x9B05688C2B3E6C1F);
		ctx->state[6] = UL64(0x1F83D9ABFB41BD6B);
		ctx->state[7] = UL64(0x5BE0CD19137E2179);
	} else {
		/* SHA-384 */
		ctx->state[0] = UL64(0xCBBB9D5DC1059ED8);
		ctx->state[1] = UL64(0x629A292A367CD507);
		ctx->state[2] = UL64(0x9159015A3070DD17);
		ctx->state[3] = UL64(0x152FECD8F70E5939);
		ctx->state[4] = UL64(0x67332667FFC00B31);
		ctx->state[5] = UL64(0x8EB44A8768581511);
		ctx->state[6] = UL64(0xDB0C2E0D64F98FA7);
		ctx->state[7] = UL64(0x47B5481DBEFA4FA4);
	}

	ctx->is384 = is384;

	return(0);
}

int sha512_starts(sha512_context *ctx)
{
	return __sha512_starts(ctx, 0);
}

/*
 * Round constants
 */
static const uint64_t K[80] = {
	UL64(0x428A2F98D728AE22),  UL64(0x7137449123EF65CD),
	UL64(0xB5C0FBCFEC4D3B2F),  UL64(0xE9B5DBA58189DBBC),
	UL64(0x3956C25BF348B538),  UL64(0x59F111F1B605D019),
	UL64(0x923F82A4AF194F9B),  UL64(0xAB1C5ED5DA6D8118),
	UL64(0xD807AA98A3030242),  UL64(0x12835B0145706FBE),
	UL64(0x243185BE4EE4B28C),  UL64(0x550C7DC3D5FFB4E2),
	UL64(0x72BE5D74F27B896F),  UL64(0x80DEB1FE3B1696B1),
	UL64(0x9BDC06A725C71235),  UL64(0xC19BF174CF692694),
	UL64(0xE49B69C19EF14AD2),  UL64(0xEFBE4786384F25E3),
	UL64(0x0FC19DC68B8CD5B5),  UL64(0x240CA1CC77AC9C65),
	UL64(0x2DE92C6F592B0275),  UL64(0x4A7484AA6EA6E483),
	UL64(0x5CB0A9DCBD41FBD4),  UL64(0x76F988DA831153B5),
	UL64(0x983E5152EE66DFAB),  UL64(0xA831C66D2DB43210),
	UL64(0xB00327C898FB213F),  UL64(0xBF597FC7BEEF0EE4),
	UL64(0xC6E00BF33DA88FC2),  UL64(0xD5A79147930AA725),
	UL64(0x06CA6351E003826F),  UL64(0x142929670A0E6E70),
	UL64(0x27B70A8546D22FFC),  UL64(0x2E1B21385C26C926),
	UL64(0x4D2C6DFC5AC42AED),  UL64(0x53380D139D95B3DF),
	UL64(0x650A73548BAF63DE),  UL64(0x766A0ABB3C77B2A8),
	UL64(0x81C2C92E47EDAEE6),  UL64(0x92722C851482353B),
	UL64(0xA2BFE8A14CF10364),  UL64(0xA81A664BBC423001),
	UL64(0xC24B8B70D0F89791),  UL64(0xC76C51A30654BE30),
	UL64(0xD192E819D6EF5218),  UL64(0xD69906245565A910),
	UL64(0xF40E35855771202A),  UL64(0x106AA07032BBD1B8),
	UL64(0x19A4C116B8D2D0C8),  UL64(0x1E376C085141AB53),
	UL64(0x2748774CDF8EEB99),  UL64(0x34B0BCB5E19B48A8),
	UL64(0x391C0CB3C5C95A63),  UL64(0x4ED8AA4AE3418ACB),
	UL64(0x5B9CCA4F7763E373),  UL64(0x682E6FF3D6B2B8A3),
	UL64(0x748F82EE5DEFB2FC),  UL64(0x78A5636F43172F60),
	UL64(0x84C87814A1F0AB72),  UL64(0x8CC702081A6439EC),
	UL64(0x90BEFFFA23631E28),  UL64(0xA4506CEBDE82BDE9),
	UL64(0xBEF9A3F7B2C67915),  UL64(0xC67178F2E372532B),
	UL64(0xCA273ECEEA26619C),  UL64(0xD186B8C721C0C207),
	UL64(0xEADA7DD6CDE0EB1E),  UL64(0xF57D4F7FEE6ED178),
	UL64(0x06F067AA72176FBA),  UL64(0x0A637DC5A2C898A6),
	UL64(0x113F9804BEF90DAE),  UL64(0x1B710B35131C471B),
	UL64(0x28DB77F523047D84),  UL64(0x32CAAB7B40C72493),
	UL64(0x3C9EBE0A15C9BEBC),  UL64(0x431D67C49C100D4C),
	UL64(0x4CC5D4BECB3E42B6),  UL64(0x597F299CFC657E2A),
	UL64(0x5FCB6FAB3AD6FAEC),  UL64(0x6C44198C4A475817)
};

static int sha512_process(sha512_context *ctx, const unsigned char data[128])
{
	int i;
	uint64_t temp1, temp2, W[80];
	uint64_t A, B, C, D, E, F, G, H;

#define  SHR(x,n) (x >> n)
#define ROTR(x,n) (SHR(x,n) | (x << (64 - n)))

#define S0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^  SHR(x, 7))
#define S1(x) (ROTR(x,19) ^ ROTR(x,61) ^  SHR(x, 6))

#define S2(x) (ROTR(x,28) ^ ROTR(x,34) ^ ROTR(x,39))
#define S3(x) (ROTR(x,14) ^ ROTR(x,18) ^ ROTR(x,41))

#define F0(x,y,z) ((x & y) | (z & (x | y)))
#define F1(x,y,z) (z ^ (x & (y ^ z)))

#define P(a,b,c,d,e,f,g,h,x,K)                  \
{                                               \
    temp1 = h + S3(e) + F1(e,f,g) + K + x;      \
    temp2 = S2(a) + F0(a,b,c);                  \
    d += temp1; h = temp1 + temp2;              \
}

	for (i = 0; i < 16; i++) {
		GET_UINT64_BE(W[i], data, i << 3);
	}

	for (; i < 80; i++) {
		W[i] = S1(W[i -  2]) + W[i -  7] +
		       S0(W[i - 15]) + W[i - 16];
	}

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];
	E = ctx->state[4];
	F = ctx->state[5];
	G = ctx->state[6];
	H = ctx->state[7];
	i = 0;

	do {
		P(A, B, C, D, E, F, G, H, W[i], K[i]);
		i++;
		P(H, A, B, C, D, E, F, G, W[i], K[i]);
		i++;
		P(G, H, A, B, C, D, E, F, W[i], K[i]);
		i++;
		P(F, G, H, A, B, C, D, E, W[i], K[i]);
		i++;
		P(E, F, G, H, A, B, C, D, W[i], K[i]);
		i++;
		P(D, E, F, G, H, A, B, C, W[i], K[i]);
		i++;
		P(C, D, E, F, G, H, A, B, W[i], K[i]);
		i++;
		P(B, C, D, E, F, G, H, A, W[i], K[i]);
		i++;
	} while (i < 80);

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;
	ctx->state[4] += E;
	ctx->state[5] += F;
	ctx->state[6] += G;
	ctx->state[7] += H;

	return(0);
}

/*
 * SHA-512 process buffer
 */
int sha512_update(sha512_context *ctx, const unsigned char *input, size_t ilen)
{
	int ret;
	size_t fill;
	unsigned int left;

	if (ilen == 0)
		return(0);

	left = (unsigned int)(ctx->total[0] & 0x7F);
	fill = 128 - left;

	ctx->total[0] += (uint64_t)ilen;

	if (ctx->total[0] < (uint64_t)ilen)
		ctx->total[1]++;

	if (left && ilen >= fill) {
		memcpy((void *)(ctx->buffer + left), input, fill);

		if ((ret = sha512_process(ctx, ctx->buffer)) != 0)
			return(ret);

		input += fill;
		ilen  -= fill;
		left = 0;
	}

	while (ilen >= 128) {
		if ((ret = sha512_process(ctx, input)) != 0)
			return(ret);

		input += 128;
		ilen  -= 128;
	}

	if (ilen > 0)
		memcpy((void *)(ctx->buffer + left), input, ilen);

	return(0);
}

/*
 * SHA-512 final digest
 */
int sha512_finish(sha512_context *ctx, unsigned char output[64])
{
	int ret;
	unsigned used;
	uint64_t high, low;

	/*
	 * Add padding: 0x80 then 0x00 until 16 bytes remain for the length
	 */
	used = ctx->total[0] & 0x7F;

	ctx->buffer[used++] = 0x80;

	if (used <= 112) {
		/* Enough room for padding + length in current block */
		memset(ctx->buffer + used, 0, 112 - used);
	} else {
		/* We'll need an extra block */
		memset(ctx->buffer + used, 0, 128 - used);

		if ((ret = sha512_process(ctx, ctx->buffer)) != 0)
			return(ret);

		memset(ctx->buffer, 0, 112);
	}

	/*
	 * Add message length
	 */
	high = (ctx->total[0] >> 61)
	       | (ctx->total[1] <<  3);
	low  = (ctx->total[0] <<  3);

	PUT_UINT64_BE(high, ctx->buffer, 112);
	PUT_UINT64_BE(low,  ctx->buffer, 120);

	if ((ret = sha512_process(ctx, ctx->buffer)) != 0)
		return(ret);

	/*
	 * Output final state
	 */
	PUT_UINT64_BE(ctx->state[0], output,  0);
	PUT_UINT64_BE(ctx->state[1], output,  8);
	PUT_UINT64_BE(ctx->state[2], output, 16);
	PUT_UINT64_BE(ctx->state[3], output, 24);
	PUT_UINT64_BE(ctx->state[4], output, 32);
	PUT_UINT64_BE(ctx->state[5], output, 40);

	if (ctx->is384 == 0) {
		PUT_UINT64_BE(ctx->state[6], output, 48);
		PUT_UINT64_BE(ctx->state[7], output, 56);
	}

	return(0);
}

void sha512_csum(const unsigned char *input, unsigned int ilen,
		 unsigned char output[64])
{
	sha512_context ctx;

	sha512_starts(&ctx);
	sha512_update(&ctx, input, ilen);
	sha512_finish(&ctx, output);
}
